Remove mitt dependency from package json

- We hope to add this back soon, but for now there
  are too many API inconsistencies

package.json

@@ -105,7 +105,6 @@
     "mermaid": "^8.5.2",
     "mersenne-twister": "1.1.0",
     "minimatch": "^3.0.4",
-    "mitt": "^1.2.0",
     "monaco-editor": "^0.18.1",
     "monaco-editor-webpack-plugin": "^1.7.0",
     "mousetrap": "^1.4.6",

yarn.lock

@@ -8232,11 +8232,6 @@ mississippi@^3.0.0:
     stream-each "^1.1.0"
     through2 "^2.0.0"
 
-mitt@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/mitt/-/mitt-1.2.0.tgz#cb24e6569c806e31bd4e3995787fe38a04fdf90d"
-  integrity sha512-r6lj77KlwqLhIUku9UWYes7KJtsczvolZkzp8hbaDPPaE24OmWl5s539Mytlj22siEQKosZ26qCBgda2PKwoJw==
-
 mixin-deep@^1.2.0:
   version "1.3.2"
   resolved "https://registry.yarnpkg.com/mixin-deep/-/mixin-deep-1.3.2.tgz#1120b43dc359a785dce65b55b82e257ccf479566"
@@ -9763,16 +9758,11 @@ rc@^1.2.8, rc@~1.2.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
-react-is@^16.12.0:
+react-is@^16.12.0, react-is@^16.8.4:
   version "16.13.1"
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.13.1.tgz#789729a4dc36de2999dc156dd6c1d9c18cea56a4"
   integrity sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==
 
-react-is@^16.8.4:
-  version "16.8.6"
-  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.8.6.tgz#5bbc1e2d29141c9fbdfed456343fe2bc430a6a16"
-  integrity sha512-aUk3bHfZ2bRSVFFbbeVS4i+lNPZr3/WM5jT2J5omUVV1zzcs1nAaf3l51ctA5FFvCRbhrH0bdAsRRQddFJZPtA==
-
 read-pkg-up@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-1.0.1.tgz#9d63c13276c065918d57f002a57f40a1b643fb02"